/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/***********************************************************************
 * examples/kernel_sample/mutex.c
 *
 *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ***********************************************************************/

#include <stdio.h>
#include <pthread.h>
#include "kernel_sample.h"

#ifndef NULL
# define NULL (void*)0
#endif

#define NLOOPS 32

static pthread_mutex_t mut;
static volatile int my_mutex = 0;
static unsigned long nloops[2] = {0, 0};
static unsigned long nerrors[2] = {0, 0};

static void *thread_func(void *parameter)
{
	int id  = (int)parameter;
	int ndx = id - 1;
	int i;

	for (nloops[ndx] = 0; nloops[ndx] < NLOOPS; nloops[ndx]++) {
		int status = pthread_mutex_lock(&mut);
		if (status != 0) {
			printf("ERROR thread %d: pthread_mutex_lock failed, status=%d\n",
				   id, status);
		}

		if (my_mutex == 1) {
			printf("ERROR thread=%d: "
				   "my_mutex should be zero, instead my_mutex=%d\n",
				   id, my_mutex);
			nerrors[ndx]++;
		}

		my_mutex = 1;
		for (i = 0; i < 10; i++) {
			pthread_yield();
		}
		my_mutex = 0;

		status = pthread_mutex_unlock(&mut);
		if (status != 0) {
			printf("ERROR thread %d: pthread_mutex_unlock failed, status=%d\n",
				   id, status);
		}
	}
	pthread_exit(NULL);
	return NULL; /* Non-reachable -- needed for some compilers */
}

void mutex_test(void)
{
	pthread_t thread1, thread2;
#ifdef SDCC
	pthread_addr_t result1, result2;
	pthread_attr_t attr;
#endif
	int status;

	/* Initialize the mutex */

	printf("Initializing mutex\n");
	pthread_mutex_init(&mut, NULL);

	/* Start two thread instances */

	printf("Starting thread 1\n");
#ifdef SDCC
	(void)pthread_attr_init(&attr);
	status = pthread_create(&thread1, &attr, thread_func, (pthread_addr_t)1);
#else
	status = pthread_create(&thread1, NULL, thread_func, (pthread_addr_t)1);
#endif
	if (status != 0) {
		printf("Error in thread#1 creation\n");
	}

	printf("Starting thread 2\n");
#ifdef SDCC
	status = pthread_create(&thread2, &attr, thread_func, (pthread_addr_t)2);
#else
	status = pthread_create(&thread2, NULL, thread_func, (pthread_addr_t)2);
#endif
	if (status != 0) {
		printf("Error in thread#2 creation\n");
	}

#ifdef SDCC
	pthread_join(thread1, &result1);
	pthread_join(thread2, &result2);
#else
	pthread_join(thread1, NULL);
	pthread_join(thread2, NULL);
#endif

	printf("\t\tThread1\tThread2\n");
	printf("\tLoops\t%lu\t%lu\n", nloops[0], nloops[1]);
	printf("\tErrors\t%lu\t%lu\n", nerrors[0], nerrors[1]);
}
